I do have a few TM pistols but never filled them with anything yet. Just don't want to screw them up. My secondary is KJW M9 with 3 mags. I think I overcharged at least one of them because it started leaking recently. If I fill the M9 mags for 5 sec it is not enough to empty the full clip, so I usually charged them for 6-7 sec.
I also have WE Scar with 5 mags. I bought them all used and had to reseal all of them and oil the valves. I think they still leak a bit but not as much as before. It takes a couple of weeks now for all the gas inside to leak out. So basically, I just want to make sure I don't screw them up.
I am wondering what other people experiences are like.

It says not advised for use in cold seasons but what is his definition of cold?what temp is too cold?what temp is pushing it but will b ok with proper care?i wanna play a skirmish on nov 9. night game......we ak74un we g17 using propane

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If you work for a living,why do you kill yourself working?

I've seen people state that propane starts to lose pressure between 5-15c.
An overnight game in Southern Ontario will be pretty close to 0, according to weather forecasts for the 9th, so you may want to have an AEG backup.

If you keep your mags inside your coat, to keep them warm, you may have decent results.